In order to meet the application requirements of the load of test hel icopter blade,a testing method of blade load based on fiber Bragg grating senso r is proposed and studied.Firstly,according to the related mechanics theory of blade model,load decoupling equation of the blade based on fiber Bragg grating is derived,and then Load decoupling is executed according to the decoupling eq uation.Subsequently,the static calibration experiment of the blade is carried out and the relationship between the moment and the center wavelength shift of t he fiber Bragg grating is obtained.Finally,the calibration results is applied to the load test of the helicopter blade and compared with the results of the st rain gauge.The experimental results show that the periodicity,regularity and m agnitude of the moment curve measured by the fiber Bragg grating are basically c onsistent with the results of the strain gauge.The correlation coefficient of t he curve is near and above 0.96.The comparison results prove that the feasibili ty of applying fiber Bragg grating to the load test helicopter blade.